Designed to run on dsPICDEMTM 1.AudioConverter Studio X AudioConverter Studio is a software with two capable functionalities in it.PIC24/dsPIC DSC G.711 Speech Encoding/Decoding Library User's Guide assists in using the library.Full compliance with Microchip's MPLAB® C30 C compiler language tools.Storing compressed speech requires 8 KB of memory per second of speech.Encoded files can be created from the desktop using a PC microphone or WAV file. Playback-only applications benefit from the Speech Encoder Utility.Two analog output interfaces - codec or on-chip PWM.Two analog input interfaces - codec or on-chip ADC.PESQ-based Mean Opinion Score (MOS): 4.3 to 4.5 (out of 5.0).Key features of the G.711 Speech Encoding/Decoding Library: Please refer to user’s guide for resource requirements Once the encoded speech files are created, they are added to an MPLAB® IDE project, just like a regular source file, and built into the application. Encoded speech files are made from either a PC microphone or existing WAV file. Storing compressed speech for playback requires 8 KB of memory for each second of speech.Ī PC-based Speech Encoder Utility program creates encoded speech files for playback. The speech decoder plays decoded speech through an external codec or the on-chip Pulse Width Modulator (PWM).
The speech encoder samples speech at 8 kHz using either an external codec or the on-chip 12-bit Analog-to-Digital Converter (ADC). Some target applications include:Ī flexible analog interface gives your design several options to consider. However, due to its high output data rate, it is most suitable for full-duplex communications applications that do not need to store the encoded speech for subsequent playback. The G.711 library can be used for both half-duplex and full-duplex systems. G.711 uses minimal computational resources, and a well-defined API makes it easy to integrate with the application. The encoding algorithm used is either A-law or μ-law companding (user-selectable), and features a 2:1 compression ratio. The library is an implementation of the ITU-T G.711 standard on the dsPIC DSC. The PIC24/dsPIC® Digital Signal Controller (DSC) G.711 Speech Encoding/Decoding Library performs toll-quality voice compression and voice decompression.
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